Underground space flood regulation and storage structure

Abstract

The application relates to the technical field of flood regulation, and discloses an underground space flood regulation and storage structure, which comprises a bottom plate, side walls, retaining walls and partition walls. A plurality of side walls are sequentially connected at the head and tail and fixedly connected with the bottom plate to form a basement. A plurality of retaining walls are sequentially connected at the head and tail and fixedly connected with the bottom plate. A plurality of side walls and the bottom plate enclose a fertilizer groove. A plurality of partition walls are arranged in the fertilizer groove and divide the fertilizer groove into a primary sedimentation and flood storage bin, a secondary sedimentation and flood storage bin and a filter and flood storage bin. A water inlet pipe, which is communicated with a municipal sand well, is arranged on the retaining wall of the primary sedimentation and flood storage bin. A flap valve is arranged in the water inlet pipe. A fine grid is arranged between the primary sedimentation and flood storage bin and the secondary sedimentation and flood storage bin. An activated carbon filter block is arranged between the secondary sedimentation and flood storage bin and the filter and flood storage bin. Compared with the prior art, the application permanently retains the foundation pit fertilizer groove cavity around the basement as a distributed flood storage bin. In the case of extreme waterlogging, the water storage space can be flexibly allocated by means of the plurality of flood storage bins, the municipal drainage pressure can be relieved, and the flood control resilience can be enhanced.

Description

Technical Field

[0001] This invention relates to the field of flood control technology, and in particular to an underground space flood storage structure. Background Technology

[0002] With the intensification of global climate change, urban flooding problems are becoming increasingly prominent, and floods caused by extreme rainstorms pose a severe challenge to urban drainage systems. To address flooding during extreme weather events, Chinese utility model patent application CN219527497U discloses a riverbank-type multi-functional flood storage device. This device achieves flood storage by installing underground water tanks connected to the riverbank. However, this design not only requires excavating new areas to install water tanks but also fails to effectively utilize existing flood storage areas. In fact, with the continuous expansion of urban underground space development, flood storage areas formed during underground structure construction and operation are traditionally mostly backfilled, which not only occupies resources but also fails to realize their potential value. In current urban flood control systems, existing flood storage facilities often suffer from insufficient capacity and limited layout, making it difficult to quickly cope with sudden surges in flood volume. Underground flood storage areas, as ring-shaped spaces surrounding the main structure, possess a certain volume and concealment but have long remained idle, failing to participate in the urban flood control and storage system, resulting in a waste of space resources.

[0003] However, while using underground flood storage trenches directly can alleviate the problem of insufficient storage capacity, several issues have emerged in the subsequent handling after the flood peak: In the pumping and drainage process, the flood storage trench, being a ring-shaped space without any internal partitions, allows impurities such as silt, fallen leaves, and construction waste carried by the flood to be evenly distributed throughout the entire trench. Traditional trench dredging methods mainly rely on manual labor combined with small mechanical equipment. Because the trench surrounds the main underground structure, the space is narrow and the working surface is irregular, making it impossible for large dredging equipment to enter. Workers must use hand tools to go deep into the trench to clean the silt, which inevitably consumes a lot of manpower and financial resources. Furthermore, the silt may contain harmful microorganisms, heavy metals, and other pollutants, and long-term exposure can threaten the health of workers. Summary of the Invention

[0004] To address the aforementioned technical problems, the purpose of this invention is to provide an underground space flood control and regulation structure that solves the problems of existing technologies being unable to rationally utilize flood storage and regulation channels, as well as the difficulties in dredging, waste of manpower and resources, and harm to health that occur after flood storage in flood storage channels.

[0005] Based on this, the present invention provides an underground space flood control and storage structure, which is installed around the perimeter of a basement. The basement includes a floor slab and multiple side walls, which are sequentially connected end-to-end and fixedly installed on the top of the floor slab. The underground space flood control and storage structure comprises: The retaining wall, the base plate extends to the outside of the basement, and a plurality of retaining walls are connected end to end and fixedly installed on the base plate extending to the outside of the basement. The plurality of retaining walls and a plurality of side walls are spaced apart, and the plurality of retaining walls, the plurality of side walls and the base plate enclose a trench. First partition wall; Second partition wall; Third partition wall; The first, second, and third partition walls are spaced apart on the base plate along the extension direction of the trough. Each partition wall abuts against the side wall and the retaining wall. The base plate, the first partition wall, and the second partition wall together form a primary sedimentation flood storage chamber; the base plate, the second partition wall, and the third partition wall together form a secondary sedimentation flood storage chamber; and the base plate, the third partition wall, and the first partition wall together form a filtration flood storage chamber. The retaining wall of the primary sedimentation flood storage chamber is equipped with an inlet pipe connected to the municipal sand well, the top of the second partition wall is equipped with a first filter element, and the top of the third partition wall is equipped with a second filter element.

[0006] In some embodiments of this application, the first filter element is a fine grid, and the second filter element is an activated carbon filter block.

[0007] In some embodiments of this application, the primary sedimentation flood storage chamber is provided with a flood diversion pipe connected to the inlet pipe, and the inlet of the flood diversion pipe is provided with a coarse screen.

[0008] In some embodiments of this application, a supplementary wall is provided inside the primary sedimentation flood storage chamber. The supplementary wall abuts against the side wall and the retaining wall, and the supplementary wall, the side wall, the retaining wall and the first partition wall enclose and form a maintenance manhole.

[0009] In some embodiments of this application, the bottom plate of the second sedimentation flood storage tank is inclined to form a slope, and the bottom of the slope is recessed to form a silt collection pool, which is located at the edge of the second partition wall.

[0010] In some embodiments of this application, the bottom plate of the filter flood storage tank is provided with a plurality of flushing nozzles connected to the cleaning pipeline.

[0011] In some embodiments of this application, water pumps are provided inside the secondary sedimentation flood storage tank and the filter flood storage tank.

[0012] In some embodiments of this application, sludge pumps are provided in the primary sedimentation flood storage tank and the secondary sedimentation flood storage tank.

[0013] In some embodiments of this application, a waist beam is fixedly connected to the retaining wall, and the waist beam has several rows along the depth direction. Each waist beam is fixedly connected to the side wall through several support beams.

[0014] In some embodiments of this application, the inlet pipe is equipped with a flap valve, and the municipal sand well is also connected to the municipal rainwater pipe.

[0015] In some embodiments of this application, a cover plate is provided on the top of the side wall and the retaining wall and fixedly connected to both. The cover plate is provided with a first inspection hole and a second inspection hole. The first inspection hole is located above the coarse grid, and the second inspection hole is located above the activated carbon filter block.

[0016] This invention provides an underground space flood control and storage structure, which has the following advantages compared with the prior art: This invention provides an underground flood control structure, comprising a base slab, side walls, and retaining walls located below ground level. Four side walls are sequentially connected end-to-end and fixedly installed on top of the base slab, forming a basement. Four retaining walls are sequentially connected end-to-end and fixedly installed on top of the base slab, with the retaining walls and side walls spaced apart. The four retaining walls, along with the side walls and the base slab, form a trough. A first, second, and third partition wall are sequentially spaced apart within the trough. These partition walls are all located on the base slab and abut against the side walls and retaining walls. The base slab, the first partition wall, and the second partition wall form a primary sedimentation flood storage chamber. The base slab, the second partition wall, and the third partition wall form a secondary sedimentation flood storage chamber. The base slab, the third partition wall, and the first partition wall form a filtration flood storage chamber. The retaining wall of the primary sedimentation flood storage chamber is equipped with an inlet pipe connected to a municipal sand well. The top of the second partition wall is equipped with a fine grid, and the top of the third partition wall is equipped with an activated carbon filter block.

[0017] Based on the above structure, this application divides the siltation tank into interconnected primary sedimentation and flood storage chambers, secondary sedimentation and flood storage chambers by setting multiple partition walls. The primary sedimentation and flood storage chamber is connected to the municipal sand well via an inlet pipe. Municipal rainwater and floodwater are collected in the municipal sand well and can be discharged into the primary sedimentation and flood storage chamber through the inlet pipe under the control of the operator. The silt in the water enters the primary sedimentation and flood storage chamber and is settled there. When the water level in the primary sedimentation and flood storage chamber is higher than the second partition wall, it will flow into the secondary sedimentation and flood storage chamber through the fine screen. It is equipped with a fine screen that filters out impurities in the water, concentrating them in the primary sedimentation tank. Further, rainwater or floodwater entering the secondary sedimentation tank can continue to settle there. When the water level in the secondary sedimentation tank is higher than the third partition wall, it will flow into the filtration tank via activated carbon filter blocks. Because the third partition wall has activated carbon filter blocks, these blocks further adsorb impurities, improving the water quality entering the filtration tank. When the filtration tank is full, it reaches the tank's storage limit. Thus, based on the design concept of sponge cities, this application permanently preserves the cavities of the foundation pits surrounding the basement as distributed flood storage chambers. Under extreme flooding conditions, the multiple flood storage chambers formed by the cavities can flexibly allocate water storage space, alleviate municipal drainage pressure, ensure the stability of the urban drainage system, and enhance flood control resilience. Furthermore, due to the multi-stage treatment of rainwater by the multi-stage flood storage chambers in this application, sediment is concentrated in the primary and secondary sedimentation chambers. Operators can complete the sediment removal operation simply by treating the primary and secondary sedimentation chambers. In addition, operators can arrange different uses according to the water quality in different flood storage chambers, such as using the water in the primary sedimentation chamber for emergency flushing of urban roads, using the water in the secondary sedimentation chamber for watering flowers and washing cars, and using the filtered rainwater in the flood storage chamber for washing clothes, etc., realizing the multi-purpose use of rainwater and maximizing the full utilization of water resources. Attached Figure Description

[0018] Figure 1 This is a top view of an underground space flood storage structure according to some embodiments of this application; Figure 2 for Figure 1 Detailed drawing of point A in the diagram Figure 3 for Figure 1 Schematic diagram of the BB cross section in the middle; Figure 4 for Figure 1 Schematic diagram of the CC section in the image; Figure 5 This is a top view of the cover plate structure of some embodiments of this application; Figure 6 This is a schematic diagram of the structure of the coarse bar and the flood diversion pipe in some embodiments of this application; Figure 7 This is a schematic diagram of the structure of the fine grid in some embodiments of this application; Figure 8 This is a schematic diagram of the structure of a flushing nozzle according to some embodiments of this application.

[0019] In the diagram, 1. Side wall; 2. Retaining wall; 3. Base plate; 4. First partition wall; 5. Second partition wall; 6. Third partition wall; 7. Municipal sand well; 8. Inlet pipe; 9. Flap gate; 10. Municipal rainwater pipe; 11. Fine screen; 12. Activated carbon filter block; 13. Coarse screen; 14. Flood diversion pipe; 15. Supplementary wall; 16. Silt collection tank; 17. Flushing nozzle; 18. Water pump; 19. Sludge pump; 20. Waist beam; 21. Support beam; 22. Cover plate; 23. First inspection hole; 24. Second inspection hole; 100. Basement; 200. Fertilizer tank; 201. Primary sedimentation flood storage tank; 202. Secondary sedimentation flood storage tank; 203. Filtration flood storage tank. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] It should be understood that the terms "before," "after," etc., are used in this invention to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, "before" information can also be called "after" information, and "after" information can also be called "before" information, without departing from the scope of this invention.

[0022] like Figures 1 to 8As shown, this embodiment of the invention provides an underground space flood control structure, including a base slab 3, side walls 1, and retaining walls 2 located below ground level. Multiple side walls 1 are connected end to end and fixedly installed on the top of the base slab 3. The multiple side walls 1 and the base slab 3 enclose a basement 100. Multiple retaining walls 2 are connected end to end and fixedly installed on the top of the base slab 3. The multiple retaining walls 2 and multiple side walls 1 are spaced apart. The multiple retaining walls 2, multiple side walls 1, and the base slab 3 enclose a trough 200. More specifically, in this embodiment, there are four side walls 1 and four retaining walls 2, with each side wall 1 corresponding to one of the four retaining walls 2. The gaps formed between the four side walls 1 and the four retaining walls 2 constitute the structure of the trough 200. Furthermore, a first partition wall 4, a second partition wall 5, and a third partition wall 6 are spaced apart on the bottom plate 3 inside the trough 200. The first partition wall 4, the second partition wall 5, and the third partition wall 6 all abut against the side walls 1 and the retaining walls 2. The bottom plate 3, the first partition wall 4, and the second partition wall 5 enclose the initial sedimentation flood storage chamber 201, and the bottom plate 3, the second partition wall 5, and the third partition wall 6 enclose the... The secondary sedimentation flood storage chamber 202 is formed by the bottom plate 3, the third partition wall 6 and the first partition wall 4 enclosing a filter flood storage chamber 203. The top of the second partition wall 5 is provided with a first filter element, and the top of the third partition wall 6 is provided with a second filter element. In this application, the first filter element is a fine grid 11 for filtering leaves and floating branches, and the second filter element is an activated carbon filter block 12 for filtering silt. The retaining wall 2 of the primary sedimentation flood storage chamber 201 is provided with an inlet pipe 8 connected to the municipal sand well 7. The municipal sand well 7 is connected to the municipal rainwater pipe 10. The inlet pipe 8 is provided with a flap gate 9 to control the periodic discharge of rainwater into the primary sedimentation flood storage chamber 201.

[0023] Based on the above structure, this application divides the flood storage tank 200 into interconnected primary sedimentation flood storage tank 201, secondary sedimentation flood storage tank 202, and filtration flood storage tank 203 by setting multiple partition walls. The primary sedimentation flood storage tank 201 is connected to the municipal sand well 7 through the inlet pipe 8. Municipal rainwater and floodwater are collected in the municipal sand well 7. When the water level in the municipal sand well 7 reaches a certain height, the flap gate 9 will be opened under the action of water pressure, realizing the automatic activation of the flood control and storage function. The floodwater or rainwater passing through the flap gate 9 is discharged into the primary sedimentation flood storage tank 201 through the inlet pipe 8. The silt in the water is mainly settled in the primary sedimentation flood storage tank 201. When the water level of the primary sedimentation flood storage tank 201 is higher than the second partition wall 5, it will pass through the fine screen 11. The water flows into the secondary sedimentation flood storage tank 202. Because the second partition wall 5 is equipped with a fine screen 11, the fine screen 11 can filter impurities in the water, causing the impurities to be concentrated and retained in the primary sedimentation flood storage tank 201. Furthermore, the rainwater or floodwater entering the secondary sedimentation flood storage tank 202 can continue to settle in the secondary sedimentation flood storage tank 202. When the water level in the secondary sedimentation flood storage tank 202 is higher than that in the third partition wall 6, it will flow into the filtration flood storage tank 203 through the activated carbon filter block 12. Because the third partition wall 6 is equipped with an activated carbon filter block 12, the activated carbon filter block 12 can further adsorb impurities in the water, improving the water quality entering the filtration flood storage tank 203. When the filtration flood storage tank 203 is full, it reaches the water storage limit of the fertilizer tank 200.

[0024] Thus, based on the design concept of sponge cities, this application permanently preserves the cavity of the foundation pit trough 200 surrounding the basement 100 as a distributed flood storage chamber. Under extreme flooding conditions, the multiple flood storage chambers formed by the trough 200 can flexibly allocate water storage space, alleviate municipal drainage pressure, ensure the stability of the urban drainage system, and enhance flood control resilience. Furthermore, due to the multi-stage treatment of rainwater by the multi-stage flood storage chambers in this application, sediment is concentrated in the primary sedimentation flood storage chamber 201 and the secondary sedimentation flood storage chamber 202. Operators can complete the sediment removal operation by treating the primary sedimentation flood storage chamber 201 and the secondary sedimentation flood storage chamber 202. In addition, different uses can be arranged according to the water quality in different flood storage chambers. For example, the water in the primary sedimentation flood storage chamber 201 can be used for emergency washing of urban roads, the water in the secondary sedimentation flood storage chamber 202 can be used for watering flowers and washing cars, and the rainwater in the filtered flood storage chamber 203 can be used for washing clothes, etc., realizing the multi-purpose use of rainwater and maximizing the full utilization of water resources.

[0025] It should be noted that in this application, the first filter element and the second filter element can be adapted to the filtration precision. In this application, based on the filtration requirements of the primary sedimentation flood storage tank and the secondary sedimentation flood storage tank, the first filter element is preferably a fine grid 11, and the second filter element is preferably an activated carbon filter block 12.

[0026] Optionally, in some embodiments of this application, the primary sedimentation flood storage tank 201 is provided with a flood diversion pipe 14 connected to the inlet pipe 8, and a coarse screen 13 is provided near the fine screen 11 at the inlet of the flood diversion pipe 14. Based on the above structure, the coarse screen 13 can filter the floodwater or rainwater entering the primary sedimentation flood storage tank 201 first, removing leaves, floating branches and large particles of sediment in the rainwater or floodwater before the fine screen 11, and concentrating large particles of impurities at the top of the coarse screen 13 of the flood diversion pipe 14, reducing the filtration pressure of the fine screen 11, which can then further filter small particles of impurities; the flood diversion pipe 14 can guide the floodwater or rainwater to slowly fall to the bottom of the well, reducing the noise of the water falling, and at the same time reducing the impact of the floodwater or rainwater falling from a height on the sedimentation of sediment in the water, thus improving the sedimentation effect of the primary sedimentation flood storage tank 201.

[0027] Furthermore, the primary sedimentation flood storage chamber 201 of this application is equipped with a supplementary wall 15, which abuts against the side wall 1 and the retaining wall 2. The supplementary wall 15, together with the side wall 1, the retaining wall 2, and the first partition wall 4, forms a maintenance manhole. Based on the above structure, the supplementary wall 15 separates the flood diversion pipe 14 from the other spaces of the primary sedimentation flood storage chamber 201, preventing the water flow in the primary sedimentation flood storage chamber 201 from continuously impacting the flood diversion pipe 14. Operators can also enter the primary sedimentation flood storage chamber 201 through the maintenance manhole to complete dredging or maintenance operations.

[0028] Optionally, the underground space flood storage and regulation structure of this application also includes a cover plate 22, which is located on top of the side wall 1 and the retaining wall 2 and fixedly connected to them. By setting the cover plate 22 to cover the fertilizer tank 200, this application enables the fertilizer tank 200 area to be used normally in flat terrain. Accordingly, in order to clean impurities in the coarse screen 13 and quickly replace the activated carbon filter block 12, the cover plate 22 of this application is provided with a first inspection hole 23 and a second inspection hole 24. The first inspection hole 23 is located above the coarse screen 13 and the maintenance manhole, and the second inspection hole 24 is located above the activated carbon filter block 12. During use, operators can manually clean impurities such as leaves and floating branches in the coarse screen 13 in the primary sedimentation flood storage tank 201 through the first inspection hole 23, and can also enter the primary sedimentation flood storage tank 201 through the first inspection hole 23 to complete manual sludge removal or tank maintenance. They can also replace the activated carbon filter block 12 through the second inspection hole 24 to ensure the water quality of the flood storage tank 203.

[0029] like Figure 6 and Figure 7As shown, both the coarse screen 13 and the fine screen 11 of this application have small holes on their surfaces. To clarify the filtration accuracy of the coarse screen 13 and the fine screen 11, the size of the small holes on the surface of the coarse screen 13 is 10-100 mm, and the size of the small holes on the surface of the fine screen 11 is 1-10 mm. Thus, the coarse screen 13 can filter leaves, floating branches, and large particles of sediment, while the fine screen 11 can further filter small particles of sediment. Since the coarse screen 13 is closer to the bottom of the first inspection hole 23 and collects more leaves and floating branches than the fine screen 11, the impurities filtered by the coarse screen 13 are all manually cleaned and maintained periodically through the first inspection hole 23.

[0030] Optionally, the bottom plate 3 of the secondary sedimentation and flood storage chamber 202 is inclined to form a slope. When the rainwater in the secondary sedimentation and flood storage chamber 202 is pumped out, the impurities in the secondary sedimentation and flood storage chamber 202 can flow continuously along the slope to the edge of the second partition wall 5 based on their own gravity. Furthermore, a silt collection pool 16 is formed at the bottom of the slope, that is, near the edge of the second partition wall 5, to concentrate the impurities in the silt collection pool 16, ensuring that the operators can centrally process the impurities.

[0031] Furthermore, the secondary sedimentation flood storage chamber 202 and the filter flood storage chamber 203 are equipped with a water pump 18 to extract the rainwater accumulated and settled in the flood storage chamber.

[0032] Furthermore, sludge pumps 19 are installed in the primary sedimentation flood storage tank 201 and the secondary sedimentation flood storage tank 202 to clean the sludge and sediment in the primary sedimentation flood storage tank 201 and the silt collection pond 16. Specifically, in the embodiments of this application, sludge pumps with a head of 5-45m are used.

[0033] Similar to the primary sedimentation flood storage tank 201 and the secondary sedimentation flood storage tank 202, the bottom plate 3 of the filter flood storage tank 203 is equipped with several flushing nozzles 17 connected to the flushing pipeline. When the fertilizer tank 200 needs to be emptied to prepare for the next upcoming flood peak, the operator can open the flushing nozzles 17. External clean water flows from the flushing nozzles to the filter flood storage tank 203 through the cleaning pipeline, continuously flushing the filter flood storage tank 203. This causes the silt and sediment at the bottom of the filter flood storage tank 203 to be mixed into the water and pumped away, thereby achieving large-scale dredging and eliminating the need for operators to enter the filter flood storage tank 203 for dredging. Specifically, in this embodiment, the flushing nozzles 17 are preferably duck-type sludge flushing nozzles, which can significantly improve the flushing effect.

[0034] In addition, the retaining wall 2 of this application is fixedly connected with a waist beam 20. The waist beam 20 is provided with several layers along the depth direction. The arrangement of the waist beam 20 integrates the scattered foundation pit support piles into a whole, forming a rigid frame around the outer wall of the pit 200, and transferring the earth pressure load to the support system. Furthermore, each waist beam 20 is fixedly connected to the side wall 1 through several support beams 21. The support beams 21 can accept the earth pressure of the pit wall and transfer it to the side wall 1 of the basement 100, thereby maintaining the stability of the pit wall.

[0035] In summary, this invention provides an underground space flood control and storage structure, including a base slab, side walls, retaining walls, and partition walls. Multiple side walls are connected end-to-end in sequence and fixedly connected to the base slab to form a basement. Multiple retaining walls are connected end-to-end in sequence and fixedly connected to the base slab. Multiple side walls and the base slab enclose a trough. Multiple partition walls are located within the trough and divide the trough into a primary sedimentation flood storage chamber, a secondary sedimentation flood storage chamber, and a filtration flood storage chamber. The retaining wall of the primary sedimentation flood storage chamber is equipped with an inlet pipe connected to a municipal sand well. A flap gate is installed inside the inlet pipe. A fine grid is installed between the primary sedimentation flood storage chamber and the secondary sedimentation flood storage chamber. An activated carbon filter block is installed between the secondary sedimentation flood storage chamber and the filtration flood storage chamber. Compared with existing technologies, this application, based on the design concept of sponge cities, permanently preserves the cavity of the foundation pit trough 2 around the basement as a distributed flood storage chamber. Under extreme flood conditions, the multiple flood storage chambers formed by the trough can flexibly allocate water storage space, alleviate the pressure on municipal drainage, ensure the stability of the urban drainage system, and enhance flood control resilience. The multi-stage flood storage chambers provide multi-stage treatment of floodwater and rainwater, allowing operators to arrange different uses according to the water quality in different flood storage chambers, thus maximizing the full utilization of water resources.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An underground flood control structure, disposed around a basement (100), the basement (100) comprising a base slab (3) and multiple side walls (1), the multiple side walls (1) being sequentially connected end-to-end and fixedly disposed on the top of the base slab (3), characterized in that, The underground space flood control and storage structure includes: The retaining wall (2) extends to the outside of the basement (100). Multiple retaining walls (2) are connected end to end and fixedly installed on the basement (3) extending to the outside of the basement (100). Multiple retaining walls (2) are spaced apart from multiple side walls (1). Multiple retaining walls (2), multiple side walls (1) and the basement (3) enclose and form a trough (200). First partition wall (4); Second partition wall (5); Third partition wall (6); The first partition wall (4), the second partition wall (5), and the third partition wall (6) are spaced apart on the base plate (3) along the extension direction of the trough (200). The first partition wall (4), the second partition wall (5), and the third partition wall (6) all abut against the side wall (1) and the retaining wall (2). The base plate (3), the first partition wall (4), and the second partition wall (5) enclose to form the primary sedimentation flood storage chamber (201). The base plate (3), the second partition wall (5), and the third partition wall (6) enclose to form the secondary sedimentation flood storage chamber (202). The base plate (3), the third partition wall (6), and the first partition wall (4) enclose to form the filter flood storage chamber (203). The retaining wall (2) of the primary sedimentation flood storage chamber (201) is provided with an inlet pipe (8) connected to the municipal sand well (7), the top of the second partition wall (5) is provided with a first filter element, and the top of the third partition wall (6) is provided with a second filter element.

2. The underground space flood control and storage structure according to claim 1, characterized in that, The first filter element is a fine grid (11), and the second filter element is an activated carbon filter block (12).

3. The underground space flood control and storage structure according to claim 1, characterized in that, The primary sedimentation flood storage chamber (201) is equipped with a flood diversion pipe (14) connected to the water inlet pipe (8), and the water inlet of the flood diversion pipe (14) is equipped with a coarse screen (13).

4. The underground space flood control and storage structure according to claim 1, characterized in that, The primary sedimentation flood storage chamber (201) is provided with a supplementary wall (15), which abuts against the side wall (1) and the retaining wall (2). The supplementary wall (15), the side wall (1), the retaining wall (2) and the first partition wall (4) together form a maintenance manhole.

5. The underground space flood control and storage structure according to claim 1, characterized in that, The bottom plate (3) of the second sedimentation flood storage chamber (202) is inclined to form a slope, and the bottom of the slope is recessed to form a silt collection pool (16), which is located at the edge of the second partition wall (5).

6. The underground space flood control and storage structure according to claim 1, characterized in that, The bottom plate (3) of the filter flood storage tank (203) is provided with several flushing nozzles (17) that are connected to the cleaning pipeline.

7. The underground space flood control and storage structure according to claim 1, characterized in that, Both the secondary sedimentation flood storage tank (202) and the filtration flood storage tank (203) are equipped with water pumps (18).

8. The underground space flood control and storage structure according to claim 1, characterized in that, Both the primary sedimentation flood storage tank (201) and the secondary sedimentation flood storage tank (202) are equipped with sludge pumps (19).

9. The underground space flood control and storage structure according to claim 1, characterized in that, A waist beam (20) is fixedly connected to the retaining wall (2). The waist beam (20) has several rows along the depth direction. Each waist beam (20) is fixedly connected to the side wall (1) through several support beams (21).

10. The underground space flood control and storage structure according to claim 2, characterized in that, Includes a cover plate (22), which is located on the top of the side wall (1) and the retaining wall (2) and is fixedly connected to them. The cover plate (22) is provided with a first inspection hole (23) and a second inspection hole (24). The first inspection hole (23) is located above the coarse grid (13), and the second inspection hole (24) is located above the activated carbon filter block (12).

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